Experiences from modifications of curved spillway channels in dam rebuilding projects
2010 (English)Conference paper (Refereed)
To safely discharge higher design floods, a number of curved spillway channels need to be modified. The design flood of a dam is often released at higher reservoir level, thus giving rise to higher flow velocity in the channel. The combination of more water and higher velocity results in accentuated non-uniform channel flows. The unfavorably distributed flow into a stilling basin or plunge pool aggravates also the energy dissipation. The curved spillway channels of several existing dams are modified in physical model tests. The adopted countermeasures include heightened sidewalls, prolonged spillway piers, new partition walls, streamlining discontinuities in the waterway, the use of differential bottom elevations in cross section, addition of deflector on sidewalls or a combination of several measures. The project experiences are summarized in this paper, with emphasis on flow patterns at high discharges and countermeasures.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-179771OAI: oai:DiVA.org:kth-179771DiVA: diva2:889430
Intl. Symp. Hydraulic Physical Modeling & Field Investigation, Sept. 2010, Nanjing
QC 201601042015-12-252015-12-252016-01-04Bibliographically approved